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Schrader Pressure?

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: judgment_arms » Fri Apr 25, 2008 8:18 am

bigbob12345 wrote:
judgment_arms wrote:Hold it, Starman, every last quick-disconnect female I’ve seen for air compressors has a working pressure of only 150psi; unless it’s Chinese, in which case it has no mention of working pressure. :roll:

Now, hydraulic fittings, on the other hand, are rated to a working pressure of 1000psi :) ; and Military quick disconnects are rated to a fail pressure of 3000psi :shock: , unless I’m sorely mistaken.


Well Iv taken the quick disconnects on my HP pump up to 350psi without leaking or blowing off although they will be replaced with hydrolic quick connects eventually.


Note, I said working pressure, not burst pressure.
If I’m wrong I blame Bush, I figure every body else gets to do it… :D
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Last edited by judgment_arms on Fri Apr 25, 2008 8:32 am, edited 1 time in total.
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Unread postAuthor: bigbob12345 » Fri Apr 25, 2008 8:24 am

judgment_arms wrote:
bigbob12345 wrote:
judgment_arms wrote:Hold it, Starman, every last quick-disconnect female I’ve seen for air compressors has a working pressure of only 150psi; unless it’s Chinese, in which case it has no mention of working pressure. :roll:

Now, hydraulic fittings, on the other hand, are rated to a working pressure of 1000psi :) ; and Military quick disconnects are rated to a fail pressure of 3000psi :shock: , unless I’m sorely mistaken.


Well Iv taken the quick disconnects on my HP pump up to 350psi without leaking or blowing off although they will be replaced with hydrolic quick connects eventually.


Note, I said [u]working pressure[u], not burst pressure.
If I’m wrong I blame Bush, I figure every body else gets to do it… :D



Oh whoops sorry for the misunderstanding
Anyways Ill probably test the pressure they fail with the 600psi my HP pump can generate.

Though I do belive you are wrong on the working pressure, I have always thought that they are rated for 250psi but dont blame bush just yet because im not completely sure.
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Unread postAuthor: Fnord » Fri Apr 25, 2008 8:59 am

I've taken a mini quick connect to 900 psi with no problems. I imagine the full sized one would fail at a lower pressure than a mini, but it's still probably above 900.

The schrader valves on my hybrid work fine (600+psi), but every once in a while they start leaking because of carbon buildup. Even then all you need to do is unscrew them and clean them out.

Also, the 11x hybrid tests exposed a schrader to 1000+ psi, and it still works fine.
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Unread postAuthor: DYI » Fri Apr 25, 2008 12:13 pm

My hydraulic quick connect have a rated working pressure of 3000psi, but both the male and female sides leak badly if disconnected.

You could always use a ball valve to isolate the shrader from the chamber during firing if you're worried about it. That's what I do on my hybrid (although it's more to do with the quick connects leaking).
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Unread postAuthor: judgment_arms » Fri Apr 25, 2008 12:20 pm

DYI wrote:My hydraulic quick connect have a rated working pressure of 3000psi, but both the male and female sides leak badly if disconnected.

Sorry, my mistake. :oops:
I really should be more careful about my posts when high pressure gasses are involved, at least this time I under rated them…


DYI, you might try putting some thick oil or grease on the seal surfaces of you hydraulic fittings, it may help.
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Unread postAuthor: Brian the brain » Sat Apr 26, 2008 6:37 am

Use QD on my fridgepressor. Had them at 40 bar, without a problem.
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